выполнить умножение, помогите пожалуйста
a) (x-1)(x^2+x+1)
b) (5m+3n)(25m^2-15mn+9n^2)
a) (x-1)(x^2+x+1)
b) (5m+3n)(25m^2-15mn+9n^2)
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Answers & Comments
a) =x^3 -1
(a +b)(a² -ab +b²)=a^3 +b^3
b) 5^3m^3 +3^3n^3 = 125m^3 +27n^3